exam Maths Puzzle Numerical Ability

lnx+ln(x+2)=4

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exam Other Question

What is the process to solve x - 2x = 15 ? Do I have to factor something?
thanks! The length of a rectangle is 5cm more than 3 times the width. If the area of the rectangle is 92cm^2, find the dimensions of the rectangle to the nearest thousandth.